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CVE Record

CVE-2026-8450: HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file()

HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file(). send_file() opens its string argument with Perl's 2-arg open(). The 2-arg form interprets magic prefixes: '| cmd' and 'cmd |' open a pipe to a subprocess, '> path' and '>> path' open the path for write or append. Untrusted input passed to send_file() can run OS commands at the daemon process UID. The read-pipe form ('cmd |') also leaks subprocess stdout into the HTTP response body. The write-mode forms can create or truncate files at attacker chosen paths.

CriticalCVSS 9.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-8450 is a critical flaw in Perl HTTP::Daemon before 6.17. If an application passes attacker-controlled input to send_file(), the server can treat that input as an instruction to run commands or write files under the daemon account.

Executive priority

Treat as urgent for any internet-facing or semi-trusted Perl service using HTTP::Daemon. Prioritize inventory and patching because the vulnerability can cross from file-serving behavior into command execution.

Technical view

send_file() used Perl two-argument open(), which can interpret crafted string values as process pipes or write targets instead of filenames. Impact depends on whether untrusted input reaches send_file(), but successful abuse can execute OS commands or alter files as the daemon UID.

Likely exposure

Exposure is most likely in custom Perl services, test daemons, internal tools, or embedded HTTP handlers using HTTP::Daemon send_file() with request-controlled filenames or paths. Systems using patched package version 6.17 or vendor-fixed packages are the remediation target.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is remotely reachable when affected HTTP::Daemon functionality is exposed and application logic passes untrusted values into send_file().

Researcher notes

The core condition is data flow into send_file(), not merely package presence. Validate application reachability, version, and whether user-controlled path strings can reach the vulnerable API. Avoid assuming exploit activity without new KEV or vendor evidence.

Mitigation direction

  • Upgrade HTTP::Daemon to 6.17 or a vendor-fixed package.
  • Apply relevant Debian or Red Hat advisories where distribution packages are used.
  • Audit send_file() callers and remove untrusted input paths.
  • Restrict served files to explicit allowlisted directories and filenames.
  • If immediate patching is blocked, follow vendor guidance and reduce exposure.

Validation and detection

  • Inventory Perl HTTP-Daemon package versions across applications and hosts.
  • Search code for HTTP::Daemon send_file() usage.
  • Confirm no request parameter can directly control send_file() input.
  • Verify patched version 6.17 or vendor-fixed builds are deployed.
  • Review vendor advisories for affected package names and fixed releases.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-73: File access and web shell behavior lookup

File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · medium confidence lookup

CWE-78: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-8450 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
3ADP providers
11Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.1CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N3.95.2CISA-ADP
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

9.1Critical
CVSS 3.1 vector shape for CVE-2026-8450Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineCPANSec

    Issue identified.

  2. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  3. Source timelineCPANSec

    HTTP-Daemon 6.17 released.

  4. ADP timelineredhat-SADP

    Made public.

  5. CVE publishedCVE Program

    The CVE record was published.

  6. ADP timelineredhat-SADP

    Reported to Red Hat.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPperl-HTTP-Daemon: HTTP::Daemon: Arbitrary code execution via OS command injection in send_file()
other:Red Hat severity ratingcvssV3_1
  • 2026-05-27T05:00:58.395Z: Reported to Red Hat.
  • 2026-05-27T04:22:26.539Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
OALDERSHTTP::DaemonHTTP-Daemon, 0unaffected
Weakness

CWE details

CWE-73CWE-78

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.